I Thought About This a Few Years Back...
At THaT Time, My Quick Guess Was;
The Caramel had an Interior Wax Covered Papar.
THaT Came Over~Lapt, Spilt with the Caramel inside the Wax Papar.
The Card, I Imagine was Placed on Top of the Wax Papar,
Protecting the Card from the Caramels!
My Thoughts Came From Similar Types of Candies
THaT I've Seen Packaged & Wrapped From the 50's & 60's.
I THiNK Altoid Tins still come with the Wax Papar within...
This is JuST my Thoughts SeePiN Out Though
Maybe ErikV has Sum InSiGHT
From His E95 Philadelphia Caramel Family Card Research!?
I don't Recall Erik Discussing THiS iN His First Book:
"Sweet Recollections: The Story of the Philadelphia Caramel Company of Camden, New Jersey"
Gunna Go Take a Look at Erik's Book AGaiN ta See if He Cover'd the Wrapping... (" No Pun intended
")